Comparing the properties of straight-chain alkynes with their corresponding alkanes and alkenes of s — Hydrocarbons Chemistry Question

💡 Solution & Explanation

(A) is true; the linear structure of alkynes allows for closer packing and stronger intermolecular forces, leading to higher boiling and melting points. (B) is false; while density increases with mass, all simple alkynes are lighter than water. (C) is true; alkynes are weakly polar. (D) is false; acetylene has a garlic smell (due to phosphine impurities), while other alkynes are generally odourless.